How many threads are showing? I'm assuming all the other clearance checks are OK: cup to rocker (where you are at)/retainer to rocker/coil bind/PV clearance/retainer to seal/rocker side to side position on shaft/wipe pattern/consider the Hughes' wanting the pushrod/adj screw in a straight line viewed from the front at 50 or 60% of full lift (depends if SB or BB)/pushrod tunnel clearance

live every 24 hour block of time like it's your last day on earth